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About Fahim shah

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both plc are not in standby mode, it is confirmed only one at time is in primary mode. suppose i have controller A in pri mode i can only read & write data to plc only if my standby is disconnected from network. if i disconnected the pri controller from network and connect the secondary controller to the network in this case now i can only read data from plc can't write to it which is good. but if i connect both pri and hotstandby controller to the network now i can only read. i have configure both NOE cards ip address to the 19.168.1.101 and i am writing to same ip address.
i am using 140 NOE 211 card and quantum 140 CPU 534.
i think my NOE didn't support Automatic IP swap over on Hotsatandy

dear all
i have 2 NOE cards (network TCP/IP card) on a modicon quantum hotstandby system, one NOE install at primary CPU and one on secondary CPU. both NOE cards communicate with InTouch through same switch. the problem is that i can't write data to the plc whenever both NOE card are on the network. when i remove the standby controller from the network i can write data to the plc.
the switchover of hotstandby is tested and working fine.
can anyone tell what i am missing here.
thanks i advance